Transformer (Apache Commons Collections 4.2 API)

Type Parameters:

I - the input type to the transformer

O - the output type from the transformer

All Known Implementing Classes:

ChainedTransformer, CloneTransformer, ClosureTransformer, ConstantTransformer, ExceptionTransformer, FactoryTransformer, IfTransformer, InstantiateTransformer, InvokerTransformer, MapTransformer, NOPTransformer, PredicateTransformer, StringValueTransformer, SwitchTransformer
```
public interface Transformer<I,O>
```
Defines a functor interface implemented by classes that transform one object into another.
A Transformer converts the input object to the output object. The input object should be left unchanged. Transformers are typically used for type conversions, or extracting data from an object.
Standard implementations of common transformers are provided by TransformerUtils. These include method invocation, returning a constant, cloning and returning the string value.

Since:

1.0

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  O transform(I input)
  Transforms the input object (leaving it unchanged) into some output object.

- Method Detail
  - transform
```
O transform(I input)
```
    Transforms the input object (leaving it unchanged) into some output object.
    
    Parameters:
    
    input - the object to be transformed, should be left unchanged
    
    Returns:
    
    a transformed object
    
    Throws:
    
    ClassCastException - (runtime) if the input is the wrong class
    
    IllegalArgumentException - (runtime) if the input is invalid
    
    FunctorException - (runtime) if the transform cannot be completed